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Metal chelation based supramolecular self-assembly enables a high-performance organic anode for lithium ion batteries
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2020-10-28 , DOI: 10.1016/j.cej.2020.127525
Guangzhao Zhang , Hui Wang , Xiaolan Deng , Yu Yang , Tian Zhang , Jun Wang , Hongbo Zeng , Chaoyang Wang , Yonghong Deng

The rising pursuit for green rechargeable energy storage devices desires novel electrode materials with cost-effective, environmental-friendly properties besides high electrochemical performance, boosting the rapid development of organic electrodes. However, the organic electrode materials in most reports can hardly be used in the real applications due to relatively poor electrochemical performance. Herein, by utilizing a smart supramolecular self-assembly between metal ions and ligands, we facilely chelate the rhodizonic acid disodium salt (RA) using ferric ions and generate a novel organic anode material (RAFe) for the first time. The strong chelation interaction between ferric ions and rhodizonic acid changes its initial structure and characteristics, enabling the obtained organic RAFe compound with outstanding electrochemical performance as anode for lithium ion batteries (LIB), which includes high reversible capacity (1283 mAh/g at 0.1A/g), excellent rate capability, long cycling stability (0.5 A/g over 300 cycles with a capacity retention of 90.76%, i.e. 0.03% decay per cycle). Even at a high mass loading of 4.0 mg/cm2, this organic anode can still deliver a capacity over 1000 mAh/g with the specific area capacity of 4.09 mAh/cm2 at 0.2 A/g, and maintains it over 92.4% after 100 cycles. Apart from offering a promising organic anode material, this work also broadens the application of metal chelation interaction based supramolecular self-assembly in energy storage territory which will inspire the preparation of other high-performance organic materials for advanced LIBs.



中文翻译:

基于金属螯合的超分子自组装可实现锂离子电池的高性能有机阳极

对绿色可再充电能量存储设备的日益增长的追求是,除了具有高电化学性能外,还需要具有成本效益,环保特性的新型电极材料,从而促进有机电极的快速发展。然而,由于相对较差的电化学性能,大多数报告中的有机电极材料几乎不能用于实际应用中。本文中,通过利用金属离子与配体之间的智能超分子自组装,我们轻松地使用铁离子螯合了Rhodizonic酸二钠盐(RA),并首次生成了新型有机阳极材料(RAFe)。铁离子与Rhodizonic酸之间的强螯合相互作用改变了其初始结构和特性,每个周期衰减0.03%)。即使在4.0 mg / cm 2的高质量负载下,该有机阳极仍可提供超过1000 mAh / g的容量,在0.2 A / g时的比表面积容量为4.09 mAh / cm 2,并在之后保持92.4%以上的容量。100个循环。除了提供有前途的有机阳极材料外,这项工作还拓宽了基于金属螯合相互作用的超分子自组装技术在储能领域的应用,这将启发其他用于高级LIB的高性能有机材料的制备。

更新日期:2020-10-30
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